OP,
Think Long, have a game plan for the next few years.
I favor tubes, but I’ll keep my comments regarding your SS equipment.
1. My Office System: I tried ifi phono, nope, sent it back. tried cambridge duo, nope, sent it back. (both had good reviews) Pyle $14. MM phono sounded better than them. Eventually using built in Phono of my Little Luxman.
So, I would definitely change the ifi and buy new phono stage, from a source that allows returns. Keep going until happy (assuming other changes you make are already complete.
2. Cartridge: I prefer wide channel separation, and tight center balance: both improve imaging quite a bit. Your existing cartridge has only 23db separation, not great. It’s channel balance of 1.5db is pretty good, I like 1.0db more, but ...,
while you could change the stylus, the body will still make around 23db separation, so,
I would go for a new cartridge.
Alignment: who will install/align your cartridge for you? It HAS to be done right!
AT VM540ml
https://www.audio-technica.com/en-us/cartridges/type/moving-magnet/vm540ml
has 28db separation and tight 1.0 db channel balance. It is the one I recommend to anyone trying to improve without too high costs. AT has a trade-in program, when it gets worn, they will keep it and sell you a new one for around 1/2 price. Over time, that lowers the cost.
btw, the stiffer the cantilever: boron say, will produce a speck more/tighter bass, however if they get 28db sep with aluminum cantilever that’s darn good.
3. Preamp: My friend bought Schitt based on good reviews here/there/everywhere. We DID NOT like it, sent it back. I suspect it might be part of the problem FOR YOU, in Your System.
4. Speakers: I have never heard them, but I know any 2 way, 6-1/2" mid trying yo make bass via a port would not be my choice. Port is in the front at least.
You could try them with a Stereo Pair of Self-Powered Subs, front firing adjacent to the 2 ways. Very low bass starts mono, however the overtones become directional.
Use with preamp line out to sub’s line in; then line from sub to amp, then amp to speakers. That method removes the need for the amp to make low bass, and removes the need for your 2 way’s to try and make lower bass. Sub must have line in/line out feature.
Again, subs from a source you can return.
5. Eventually, larger 3 way speakers with larger driver for lows. No port, if so, front firing only. Keep the new to you speakers limited to high sensitivity, 90db or more. That reduces the power needs, which reduces cost/size/weight, increases placement options.
Also, efficient speakers make it much easier to try tubes. same advantages as above, plus not so much heat as a bigger tube amp.
happy days making decisions,
Elliott